Add custom mac address option to vhost interfaces.

Generating a new MAC address everytime vpp reboots can quickly
become cumbersome (e.g. in test scenarios).
This commit allows vhost mac addresses to be configured
manually.

Change-Id: Ic6d16a2d14cdf8e49dc29041bbafde39d9fc8370
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

4 files changed, 30 insertions, 13 deletions

diff --git a/vnet/vnet/devices/dpdk/dpdk.h b/vnet/vnet/devices/dpdk/dpdk.h
index 2a9d825e04d..3e287a9a166 100644
--- a/vnet/vnet/devices/dpdk/dpdk.h
+++ b/vnet/vnet/devices/dpdk/dpdk.h
@@ -511,7 +511,8 @@ int dpdk_vhost_user_create_if (vnet_main_t * vnm, vlib_main_t * vm,
                               u8 is_server,
                               u32 * sw_if_index,
                               u64 feature_mask,
-                              u8 renumber, u32 custom_dev_instance);
+                              u8 renumber, u32 custom_dev_instance,
+                              u8 *hwaddr);
 int dpdk_vhost_user_modify_if (vnet_main_t * vnm, vlib_main_t * vm,
                               const char * sock_filename,
                               u8 is_server,
diff --git a/vnet/vnet/devices/dpdk/vhost_user.c b/vnet/vnet/devices/dpdk/vhost_user.c
index 0965456e0f9..a9b2082b4d4 100644
--- a/vnet/vnet/devices/dpdk/vhost_user.c
+++ b/vnet/vnet/devices/dpdk/vhost_user.c
@@ -187,7 +187,7 @@ static inline void * map_guest_mem(dpdk_device_t * xd, u64 addr)
 }
 
 static clib_error_t *
-dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id)
+dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id, u8 *hwaddr)
 {
   dpdk_main_t * dm = &dpdk_main;
   vlib_main_t * vm = vlib_get_main();
@@ -332,6 +332,9 @@ dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id)
   /*
    * Generate random MAC address for the interface
    */
+  if (hwaddr) {
+    memcpy(addr, hwaddr, sizeof(addr));
+  } else {
     f64 now = vlib_time_now(vm);
     u32 rnd;
     rnd = (u32) (now * 1e6);
@@ -340,6 +343,7 @@ dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id)
     memcpy (addr+2, &rnd, sizeof(rnd));
     addr[0] = 2;
     addr[1] = 0xfe;
+  }
 
   error = ethernet_register_interface
     (dm->vnet_main,
@@ -1275,7 +1279,8 @@ int dpdk_vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm,
                               u8 is_server,
                               u32 * sw_if_index,
                               u64 feature_mask,
-                              u8 renumber, u32 custom_dev_instance)
+                              u8 renumber, u32 custom_dev_instance,
+                              u8 *hwaddr)
 {
   dpdk_main_t * dm = &dpdk_main;
   dpdk_device_t *xd;
@@ -1286,7 +1291,7 @@ int dpdk_vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm,
   // using virtio vhost user?
   if (dm->use_virtio_vhost) {
       return vhost_user_create_if(vnm, vm, sock_filename, is_server,
-              sw_if_index, feature_mask, renumber, custom_dev_instance);
+              sw_if_index, feature_mask, renumber, custom_dev_instance, hwaddr);
   }
 
   if (is_server) {
@@ -1300,9 +1305,9 @@ int dpdk_vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm,
       if (custom_dev_instance >= dm->next_vu_if_id)
           dm->next_vu_if_id = custom_dev_instance + 1;
 
-    dpdk_create_vhost_user_if_internal(&hw_if_idx, custom_dev_instance);
+    dpdk_create_vhost_user_if_internal(&hw_if_idx, custom_dev_instance, hwaddr);
   } else 
-    dpdk_create_vhost_user_if_internal(&hw_if_idx, (u32)~0);
+    dpdk_create_vhost_user_if_internal(&hw_if_idx, (u32)~0, hwaddr);
   DBG_SOCK("dpdk vhost-user interface created hw_if_index %d", hw_if_idx);
 
   xd = dpdk_vhost_user_device_from_hw_if_index(hw_if_idx);
@@ -1548,6 +1553,8 @@ dpdk_vhost_user_connect_command_fn (vlib_main_t * vm,
   u64 feature_mask = (u64)~0;
   u8 renumber = 0;
   u32 custom_dev_instance = ~0;
+  u8 hwaddr[6];
+  u8 *hw = NULL;
 
   if (dm->use_virtio_vhost) {
       return vhost_user_connect_command_fn(vm, input, cmd);
@@ -1564,6 +1571,8 @@ dpdk_vhost_user_connect_command_fn (vlib_main_t * vm,
       is_server = 1;
     else if (unformat (line_input, "feature-mask 0x%llx", &feature_mask))
       ;
+    else if (unformat (line_input, "hwaddr %U", unformat_ethernet_address, hwaddr))
+      hw = hwaddr;
     else if (unformat (line_input, "renumber %d", &custom_dev_instance)) {
         renumber = 1;
     }
@@ -1579,7 +1588,7 @@ dpdk_vhost_user_connect_command_fn (vlib_main_t * vm,
 
   dpdk_vhost_user_create_if(vnm, vm, (char *)sock_filename,
                             is_server, &sw_if_index, feature_mask,
-                            renumber, custom_dev_instance);
+                            renumber, custom_dev_instance, hw);
 
   vec_free(sock_filename);
   return 0;
diff --git a/vnet/vnet/devices/virtio/vhost-user.c b/vnet/vnet/devices/virtio/vhost-user.c
index 180393d4f7f..df09db87e57 100644
--- a/vnet/vnet/devices/virtio/vhost-user.c
+++ b/vnet/vnet/devices/virtio/vhost-user.c
@@ -1429,14 +1429,16 @@ static vhost_user_intf_t *vhost_user_vui_new()
 
 // create ethernet interface for vhost user intf
 static void vhost_user_create_ethernet(vnet_main_t * vnm, vlib_main_t * vm,
-                                       vhost_user_intf_t *vui)
+                                       vhost_user_intf_t *vui, u8 *hwaddress)
 {
   vhost_user_main_t * vum = &vhost_user_main;
   u8 hwaddr[6];
   clib_error_t * error;
 
   /* create hw and sw interface */
-  {
+  if (hwaddress) {
+    memcpy(hwaddr, hwaddress, 6);
+  } else {
     f64 now = vlib_time_now(vm);
     u32 rnd;
     rnd = (u32) (now * 1e6);
@@ -1529,7 +1531,8 @@ int vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm,
                          u8 is_server,
                          u32 * sw_if_index,
                          u64 feature_mask,
-                         u8 renumber, u32 custom_dev_instance)
+                         u8 renumber, u32 custom_dev_instance,
+                         u8 *hwaddr)
 {
   vhost_user_intf_t * vui = NULL;
   dpdk_main_t * dm = &dpdk_main;
@@ -1553,7 +1556,7 @@ int vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm,
   vui = vhost_user_vui_new ();
   ASSERT(vui != NULL);
 
-  vhost_user_create_ethernet (vnm, vm, vui);
+  vhost_user_create_ethernet (vnm, vm, vui, hwaddr);
   vhost_user_vui_init (vnm, vui, sockfd, sock_filename, is_server,
                        feature_mask, &sw_if_idx);
 
@@ -1626,6 +1629,8 @@ vhost_user_connect_command_fn (vlib_main_t * vm,
   u64 feature_mask = (u64)~0;
   u8 renumber = 0;
   u32 custom_dev_instance = ~0;
+  u8 hwaddr[6];
+  u8 *hw = NULL;
 
   /* Get a line of input. */
   if (! unformat_user (input, unformat_line_input, line_input))
@@ -1638,6 +1643,8 @@ vhost_user_connect_command_fn (vlib_main_t * vm,
       is_server = 1;
     else if (unformat (line_input, "feature-mask 0x%llx", &feature_mask))
       ;
+    else if (unformat (line_input, "hwaddr %U", unformat_ethernet_address, hwaddr))
+          hw = hwaddr;
     else if (unformat (line_input, "renumber %d", &custom_dev_instance)) {
         renumber = 1;
     }
@@ -1651,7 +1658,7 @@ vhost_user_connect_command_fn (vlib_main_t * vm,
 
   vhost_user_create_if(vnm, vm, (char *)sock_filename,
                        is_server, &sw_if_index, feature_mask,
-                       renumber, custom_dev_instance);
+                       renumber, custom_dev_instance, hw);
 
   vec_free(sock_filename);
 
diff --git a/vnet/vnet/devices/virtio/vhost-user.h b/vnet/vnet/devices/virtio/vhost-user.h
index 1fbc0f0bdd7..4eb4b81d753 100644
--- a/vnet/vnet/devices/virtio/vhost-user.h
+++ b/vnet/vnet/devices/virtio/vhost-user.h
@@ -50,7 +50,7 @@ typedef enum {
 int vhost_user_create_if(vnet_main_t * vnm, vlib_main_t * vm, 
     const char * sock_filename, u8 is_server,
     u32 * sw_if_index, u64 feature_mask,
-    u8 renumber, u32 custom_dev_instance);
+    u8 renumber, u32 custom_dev_instance, u8 *hwaddr);
 int vhost_user_modify_if(vnet_main_t * vnm, vlib_main_t * vm,
     const char * sock_filename, u8 is_server,
     u32 sw_if_index, u64 feature_mask,